First try at a user management screen for the desktop

chrome/browser/ui/webui/signin/user_chooser_ui.h

Index: chrome/browser/ui/webui/signin/user_chooser_ui.h
diff --git a/chrome/browser/ui/webui/signin/user_chooser_ui.h b/chrome/browser/ui/webui/signin/user_chooser_ui.h
new file mode 100644
index 0000000000000000000000000000000000000000..5c0b36a4caed37c207a5345bdd02f7cf0f16fcd2
--- /dev/null
+++ b/chrome/browser/ui/webui/signin/user_chooser_ui.h
@@ -0,0 +1,35 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_WEBUI_SIGNIN_USER_CHOOSER_UI_H_
+#define CHROME_BROWSER_UI_WEBUI_SIGNIN_USER_CHOOSER_UI_H_
+
+#include "content/public/browser/web_ui_controller.h"
+
+class UserChooserScreenHandler;
+
+namespace base {
+class DictionaryValue;
+}
+namespace content {
+class WebUIDataSource;
+}
+
+// A WebUI dialog to display available users.
+class UserChooserUI : public content::WebUIController {
+ public:
+  explicit UserChooserUI(content::WebUI* web_ui);
+  virtual ~UserChooserUI();
+
+ private:
+  content::WebUIDataSource* CreateUIDataSource(
+      const base::DictionaryValue& localized_strings);
+  void GetLocalizedStrings(base::DictionaryValue* localized_strings);
+
+  UserChooserScreenHandler* user_chooser_screen_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(UserChooserUI);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_SIGNIN_USER_CHOOSER_UI_H_